Hi Ima
I went to www.crossdresser.com and found they have a Shoe Sizing Chart. This looks like a great idea, http://www.crossdresser.com/product_page.asp?ProductCatID=3&ProductSubCatID=63
For those of your looking to find out your exact feminine size in shoes this chart will give you all of the information that you need. It lists the man's sizes across from the women's sizes - It's a perfect tool for crossdressers! You can also use it to determine your shoe width.
Normally I would say figure about 2 sizes larger than your male shoes. This can very if the shoes are open toes or pointed stillettos, as the width becomes a very important factor.
So, I would order the Shoe Sizing Chart and be sure that that the shoes you order will fit.
Sandi